: Oil Usage



whitediamondsts99
02-06-07, 08:43 PM
I've always been aware of N* using their oil up pretty fast. My 97 Deville would need oh about 3/4 a qt between oil changes. My 99 sts has already taken a qt and still has 1200 miles left before oil change! I know it doesn't smoke nor leak...it only has 69,500 miles! Explanation for this?? Not to change the subject has anyone added a K&N filter to the N*, if so, good results? THANKS!:thumbsup:

Ranger
02-06-07, 08:53 PM
Go to the top left of this page. Click on TECHNICAL ARCHIVES and read up on oil consumption. It's actually a good thing.

Forget the K & N. Do a search and you'll see. It will probably hurt more than it will help.

codewize
02-06-07, 09:57 PM
Up to 1 qt per 1000 miles is considered normal by GM engineers.

Submariner409
02-07-07, 06:43 PM
No two engines "use" oil at the same rate. Engineering tolerances. We have late STS's in here that use a quart every 1 to 15 hundred miles. We have STS's in here, like mine, that use a quart every 4,000 miles. All normal. How many miles are you doing between your "needed" oil changes? For a '99 STS, it had better be a hell of a long way past 7,500, unless you idle around town all the time! Owensboro? You probably do a fair amount of long country drives. As Ranger said....read the archives, use decent name brand oils, and sleep easy.

I_Finally_Have_A_Cad
02-07-07, 07:45 PM
From the time I got my car to the first oil change, I put 5000 miles on it and only had to add half a quart.

thu
02-08-07, 03:04 PM
I have to add about 2-3 quarts between oil changes (12,500 miles).

whitediamondsts99
02-08-07, 11:51 PM
I'm just shocked right now...I've added 1 1/2 qts already! 1,000 miles to my oil change (3,000 miles). My dad sales cadillac's and he said it doesn't sound right to him. I don't think it leaks at all or atleast I have never seen it to leak. Its been parked in the garage overnight plenty of times, no oil. I know it doesn't smoke for a fact. I just dont think this sounds normal...the previous owner indicated to my dad that it did indeed use a quart between oil changes.

thu
02-09-07, 12:08 AM
Believe it or not, that is nothing to be alarmed about. If every else seems normal, 1 quart per 1,000 miles is to be expected in a N*.

You ever try the "Italian Tuneup" a.k.a. WOT cleanout? If not, search this board for these terms: WOT rings carbon

whitediamondsts99
02-09-07, 12:54 AM
I'm going to try it, i just hate to be hard on my car! I'm anti-ragging out a car....i know the side effects! thanks guys for all the respones, i've read up about this and i'll be takin my car to my pop's dealership to check my car out. I really honestly don't think there is anything wrong with it, i just want to make sure.

99Classillac
02-09-07, 08:03 AM
My car burns about a quart every 1000 miles. I just see it as extra lube in the cylinders. I don't mind pouring in the oil at the gas station.

JohnnyO
02-09-07, 02:12 PM
If it's only using a quart between oil changes, then it's either not burning much or you're changing the oil too often. :usflag:
Pre-2000 Northstars simply burn a lot of oil (if they're not leaking it too). It's a fact of life. Some things just are what they are.
Unless you run it at a track, it's perfectly fine to let it go until the Oil Level light comes on, there will still be about 5.5 quarts in there. Assuming the light is working properly.
Some people claim less consumption by keeping it a half-quart low on purpose and only putting in 7 quarts when they change oil. I do this myself on our oil-burning '99.
I noticed somewhat less consumption by running Valvoline Max Life 10w-30 instead of Mobil 1 10w-30.

Eldobroken
02-09-07, 08:09 PM
I'm just shocked right now...I've added 1 1/2 qts already! 1,000 miles to my oil change (3,000 miles). My dad sales cadillac's and he said it doesn't sound right to him. I don't think it leaks at all or atleast I have never seen it to leak. Its been parked in the garage overnight plenty of times, no oil. I know it doesn't smoke for a fact. I just dont think this sounds normal...the previous owner indicated to my dad that it did indeed use a quart between oil changes.
Normal

codewize
02-09-07, 09:44 PM
What you're seeing is well within normal limits AND don't change the oil every 3000 miles, you're wasting your money. I use about a qrt every 1500 miles. We've also been told that the N*'s that use more oil last longer. Your dad selling Cadillac's should know that. My salesman warned me.

It's been proven time and time again that virgin oil (oil just out of the bottle) is worse for your engine than oil with 5000 miles on it. Oil in fact does have a break in period. If you change the oil every 3k you're throwing away oil just as it's becoming good.

I know this goes against everything you've been taught but ask around.

Also I don't think even the pre 2000 N* spec that often, do they?


I'm just shocked right now...I've added 1 1/2 qts already! 1,000 miles to my oil change (3,000 miles). My dad sales cadillac's and he said it doesn't sound right to him. I don't think it leaks at all or atleast I have never seen it to leak. Its been parked in the garage overnight plenty of times, no oil. I know it doesn't smoke for a fact. I just dont think this sounds normal...the previous owner indicated to my dad that it did indeed use a quart between oil changes.

Ranger
02-09-07, 10:58 PM
When you take it to the dealer, they are going to try to sell you a decarbonization treatment for a couple of hundred dollars. Did you read the Technical Archives on oil consumption and full throttle acceleration aka WOT? Take it out and whoop it, "drive it like you stole it". You won't hurt it, but it will use less oil.

whitediamondsts99
02-10-07, 08:00 PM
Yeah my dad told me to start running vavoline or havoline to reduce the oil consumption. I currently run mobil 1 so I will give it a try for sure. He just started selling Cadillacs after selling Ford and Dodge for 32 years, I think I know more than him about Cadillacs! Thanks guys...no need to stress anymore!

JohnnyO
02-15-07, 10:48 AM
Also when you add oil you are somewhat replenishing the additives in the oil. Like I said, my mother's oil-burner used less when I put Max Life in it, although it is not a high-mileage car.
Just go by the OLM, or better yet run it for 7500 miles and add as needed. Then send a sample to Blackstone Labs, who will tell you it is fine and go longer next time.
If you want to go by miles you could run a quality dino oil (or syn or blend), change it every 10,000 miles (or once a year, whichever comes first), and it will be fine. Really.